安卓短信空指针异常

Question

我在将一些字符串文本作为短信发送到其他模拟器时遇到空指针异常。我有一个按钮，单击该按钮会将 textView 中存在的文本作为短信发送到其他模拟器。

这里是textview和button类的代码

    public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.ticketprocess);




         SecureMessagesActivity sma = new SecureMessagesActivity();

         message = sma.getMessageBody();
         tv= (TextView) findViewById(R.id.textView1);
           tv.setText(message); 



         submit = (Button) findViewById(R.id.button1);
         submit.setOnClickListener(new OnClickListener() {
public void onClick(View v) {

    SendSms sms = new SendSms();
    sms.sendSMS("15555215556", message);

}});

  }

这里是sendms类的代码

public class SendSms extends Activity {

    public void sendSMS(String phoneNumber, String message)
    {        
        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";

        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0,
            new Intent(SENT), 0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,
            new Intent(DELIVERED), 0);

        //---when the SMS has been sent---
        registerReceiver(new BroadcastReceiver(){
            @SuppressWarnings("deprecation")
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS sent", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                        Toast.makeText(getBaseContext(), "Generic failure", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NO_SERVICE:
                        Toast.makeText(getBaseContext(), "No service", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NULL_PDU:
                        Toast.makeText(getBaseContext(), "Null PDU", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_RADIO_OFF:
                        Toast.makeText(getBaseContext(), "Radio off", 
                                Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        }, new IntentFilter(SENT));

        //---when the SMS has been delivered---
        registerReceiver(new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case Activity.RESULT_CANCELED:
                        Toast.makeText(getBaseContext(), "SMS not delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;                        
                }
            }
        }, new IntentFilter(DELIVERED));        

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);        
    }

}

现在点击按钮设备会收到强制关闭消息，logcat 中的错误是

06-14 17:47:47.249: ERROR/AndroidRuntime(8403): FATAL EXCEPTION: main
06-14 17:47:47.249: ERROR/AndroidRuntime(8403): java.lang.NullPointerException
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.content.ContextWrapper.getPackageName(ContextWrapper.java:120)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.app.PendingIntent.getBroadcast(PendingIntent.java:226)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at com.mypackage.ULWAFMS1.SendSms.sendSMS(SendSms.java:38)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at com.mypackage.ULWAFMS1.page1$1.onClick(page1.java:43)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.view.View.performClick(View.java:2408)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.view.View$PerformClick.run(View.java:8816)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.os.Handler.handleCallback(Handler.java:587)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.os.Looper.loop(Looper.java:123)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at android.app.ActivityThread.main(ActivityThread.java:4627)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at java.lang.reflect.Method.invokeNative(Native Method)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at java.lang.reflect.Method.invoke(Method.java:521)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

问题出现在您在 sendSms 方法开始时创建 PendingIntent 对象的位置。您正在将 SendSMS 实现为一个活动，但我认为它不需要，并且它没有被正确地初始化为一个活动，所以你看到了这个失败。

从你的sendms类中取出extends Activity，然后改变你的sendSms方法以如下方式开始：

public class SendSms {

    public void sendSMS(Context context, String phoneNumber, String message)
    {        
        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";

        PendingIntent sentPI = PendingIntent.getBroadcast(context, 0,
            new Intent(SENT), 0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(context, 0,
            new Intent(DELIVERED), 0);

现在您需要从您的onClickListener 将其称为sendSms( this, "15555215556", message );；